No, as a custom ov2 file, you'll want to Manage pois, Show on Map. The file you created will show there. Check it and then look at the map.
Was that poi location on a mapped road (as contrasted to a location off-road)?
Sorry, I don't know what the problem is, then.
once we give a name to a favorite, lateron it only shows the name, not the address, do you know how to display the full address again